There are three main classes of drugs, has a different effect on the body.A. each of them B. all of themC. each of which D. all of which 题目和参考答案——青夏教育精英家教网—

题目内容

There are three main classes of drugs, ________ has a different effect on the body.

A. each of them B. all of them

C. each of which D. all of which

【解析】

试题分析：句意：药物主要有三种分类，每一种对人的身体的影响不同。根据has可知主语应该是单数，排除B、D；逗号后面没有连词，不能用each of them，如果在逗号后加一个and，则A也对；所以这里是非限制性定语从句，用which代替先行词做介词of的宾语，each of which一起做从句的主语，故选C。

考点：考查代词+关系代词引导的定语从句。

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